// Copyright © 2022 Roberto Hidalgo <chinampa@un.rob.mx>
// SPDX-License-Identifier: Apache-2.0
package command_test

import (
	"testing"

	. "git.rob.mx/nidito/chinampa/pkg/command"
	"github.com/spf13/pflag"
)

func TestResolveTemplate(t *testing.T) {
	overrideFlags := &pflag.FlagSet{}
	overrideFlags.String("option", "override", "stuff")
	overrideFlags.Bool("bool", false, "stuff")
	overrideFlags.Bool("help", false, "stuff")
	overrideFlags.Bool("no-color", false, "stuff")
	overrideFlags.Bool("skip-validation", false, "stuff")
	err := overrideFlags.Parse([]string{"--option", "override", "--bool", "--help", "--no-color", "--skip-validation"})
	if err != nil {
		t.Fatalf("Could not parse test flags")
	}

	cases := []struct {
		Tpl      string
		Expected string
		Args     []string
		Flags    *pflag.FlagSet
		Errors   bool
	}{
		{
			Tpl:      "adds nothing to nothing",
			Expected: "adds nothing to nothing",
			Errors:   false,
			Args:     []string{},
			Flags:    &pflag.FlagSet{},
		},
		{
			Tpl:      `prints default option as {{ Opt "option" }}`,
			Expected: "prints default option as --option default",
			Errors:   false,
			Args:     []string{},
			Flags:    &pflag.FlagSet{},
		},
		{
			Tpl:      `prints default option value as {{ .Opts.option }}`,
			Expected: "prints default option value as default",
			Errors:   false,
			Args:     []string{},
			Flags:    &pflag.FlagSet{},
		},
		{
			Tpl:      `prints default argument as {{ Arg "argument_0" }}`,
			Expected: "prints default argument as default",
			Errors:   false,
			Args:     []string{},
			Flags:    &pflag.FlagSet{},
		},
		{
			Tpl:      `prints default argument value as {{ .Args.argument_0 }}`,
			Expected: "prints default argument value as default",
			Errors:   false,
			Args:     []string{},
			Flags:    &pflag.FlagSet{},
		},
		{
			Tpl:      `overrides default option as {{ Opt "option" }}`,
			Expected: "overrides default option as --option override",
			Errors:   false,
			Args:     []string{},
			Flags:    overrideFlags,
		},
		{
			Tpl:      `overrides default argument as {{ Arg "argument_0" }}`,
			Expected: "overrides default argument as override",
			Errors:   false,
			Args:     []string{"override"},
			Flags:    &pflag.FlagSet{},
		},
		{
			Tpl:      `combines defaults as {{ Opt "option" }} {{ Opt "bool"}} {{ Arg "argument_0" }}`,
			Expected: "combines defaults as --option default --bool false default",
			Errors:   false,
			Args:     []string{},
			Flags:    &pflag.FlagSet{},
		},
		{
			Tpl:      `combines overrides as {{ Opt "option" }} {{ Opt "bool" }} {{ Arg "argument_0" }}`,
			Expected: "combines overrides as --option override --bool true twice",
			Errors:   false,
			Args:     []string{"twice"},
			Flags:    overrideFlags,
		},
		{
			Tpl:      `prints variadic as {{ Arg "argument_0" }} {{ Arg "argument_n" }}`,
			Expected: "prints variadic as override a b",
			Errors:   false,
			Args:     []string{"override", "a", "b"},
			Flags:    &pflag.FlagSet{},
		},
		{
			Tpl:      `doesn't error on bad names {{ Opt "bad-option" }} {{ Arg "bad-argument" }}`,
			Expected: "doesn't error on bad names  ",
			Errors:   false,
			Args:     []string{},
			Flags:    &pflag.FlagSet{},
		},
		{
			Tpl:    `errors on bad templates {{ BadFunc }}`,
			Args:   []string{},
			Flags:  &pflag.FlagSet{},
			Errors: true,
		},
	}

	for _, test := range cases {
		test := test
		t.Run(test.Expected, func(t *testing.T) {
			cmd := (&Command{
				Arguments: []*Argument{
					{
						Name:    "argument_0",
						Default: "default",
					},
					{
						Name:     "argument_n",
						Variadic: true,
					},
				},
				Options: Options{
					"option": {
						Default: "default",
						Type:    "string",
					},
					"bool": {
						Type:    "bool",
						Default: false,
					},
				},
			}).SetBindings()
			cmd.Arguments.Parse(test.Args) // nolint: errcheck
			cmd.Options.Parse(test.Flags)
			res, err := cmd.ResolveTemplate(test.Tpl, "")

			if err != nil && !test.Errors {
				t.Fatalf("good template failed: %s", err)
			}

			if res != test.Expected {
				t.Fatalf("expected '%s' got '%s'", test.Expected, res)
			}
		})
	}
}